电解质
法拉第效率
材料科学
聚丙烯腈
电化学
化学工程
阳极
电极
环氧乙烷
聚合物
锂(药物)
锂电池
电化学窗口
分离器(采油)
电池(电)
纳米技术
离子电导率
离子键合
化学
离子
复合材料
有机化学
功率(物理)
物理化学
内分泌学
工程类
物理
热力学
医学
量子力学
共聚物
作者
Ying Liu,Feng Fu,Chen Sun,Aotian Zhang,Hong Teng,Liqun Sun,Haiming Xie
标识
DOI:10.3390/inorganics10040042
摘要
Poly(ethylene oxide) (PEO)-based electrolyte is considered to be one of the most promising polymer electrolytes for lithium metal batteries. However, a narrow electrochemical stability window and poor compatibility at electrode-electrolyte interfaces restrict the applications of PEO-based electrolyte. An in situ synthetic double-layer polymer electrolyte (DLPE) with polyacrylonitrile (PAN) layer and PEO layer was designed to achieve a stable interface and application in high-energy-density batteries. In this special design, the hydroxy group of PEO-SPE can form an O-H---N hydrogen bond with the cyano group in PAN-SPE, which connects the two layers of DLPE at a microscopic chemical level. A special Li+ conducting mechanism in DLPE provides a uniform Li+ flux and fast Li+ conduction, which achieves a stable electrolyte/electrode interface.LiFePO4/DLPE/Li battery shows superior cycling stability, and the coulombic efficiency remains 99.5% at 0.2 C. Meanwhile, LiNi0.6Co0.2Mn0.2O2/DLPE/Li battery shows high specific discharge capacity of 176.0 mAh g−1 at 0.1 C between 2.8 V to 4.3 V, and the coulombic efficiency remains 95% after 100 cycles. This in situ synthetic strategy represents a big step forward in addressing the interface issues and boosting the development of high-energy-density lithium-metal batteries.
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